From 158eeefb1989b50eadc74575efcf5a36a6b2cfac Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@redhat.com>
Date: Fri, 7 Mar 2008 14:56:02 -0800
Subject: [PATCH] --- yaml --- r: 87057 b: refs/heads/master c:
 84c6f6046c5a2189160a8f0dca8b90427bf690ea h: refs/heads/master i:   87055:
 8cf07fcbad0d2e456600cab4dc10f8849d0009a1 v: v3

---
 [refs]                         |  2 +-
 trunk/arch/x86/kernel/ptrace.c | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index a3fe483c3554..a2fb76a21537 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 60d5bcec7ed6c00e3ec88749fd81229731363221
+refs/heads/master: 84c6f6046c5a2189160a8f0dca8b90427bf690ea
diff --git a/trunk/arch/x86/kernel/ptrace.c b/trunk/arch/x86/kernel/ptrace.c
index f41fdc98efb1..8f64abe699fd 100644
--- a/trunk/arch/x86/kernel/ptrace.c
+++ b/trunk/arch/x86/kernel/ptrace.c
@@ -323,6 +323,16 @@ static int putreg(struct task_struct *child,
 		return set_flags(child, value);
 
 #ifdef CONFIG_X86_64
+	/*
+	 * Orig_ax is really just a flag with small positive and
+	 * negative values, so make sure to always sign-extend it
+	 * from 32 bits so that it works correctly regardless of
+	 * whether we come from a 32-bit environment or not.
+	 */
+	case offsetof(struct user_regs_struct, orig_ax):
+		value = (long) (s32) value;
+		break;
+
 	case offsetof(struct user_regs_struct,fs_base):
 		if (value >= TASK_SIZE_OF(child))
 			return -EIO;